So how do i update this? do i have to restore to stock?
Ok this is how i got it working in my case:
1. Download the OTA update, in Settings > About > Software Updates
2. Click install
3. In my case im using TWRP so when i clicked install it boots me the TWRP menu
4. Click Install
5. Locate the downloaded OTA update in Downloads folder
7. Fix root permissions (TWRP will ask you regarding this)